How to Use the JavaScript Fetch API to Get Data
fetch('http://api.steampowered.com/ISteamUserStats/GetGlobalAchievementPercentagesForApp/v0002/?gameid=221380') .then(function(response) { return response.json(); }) .then(function(myJson) { console.log(JSON.stringify(myJson)); });
fetch to get data from server
fetch(url).then(function(response) { response.text().then(function(dataFromServer) { //do stuff }); });
how to use fetch() javascript
//Most API's will only allow you to fetch on their website. //This means you couldn't run this code in the console on // google.com because: // 1. Google demands the fetch request be from https // 2. open-notify's API blocks the request outside of their website fetch('http://api.open-notify.org/astros.json') .then(function(response) { return response.json(); }) .then(function(json) { console.log(json) }); // Here is another example. A method (function) that // grabs Game of Thrones books from an API ... function fetchBooks() { return fetch('https://anapioficeandfire.com/api/books') .then(resp => resp.json()) .then(json => renderBooks(json)); } function renderBooks(json) { const main = document.querySelector('main') json.forEach(book => { const h2 = document.createElement('h2') h2.innerHTML = `<h2>${book.name}</h2>` main.appendChild(h2) }) } document.addEventListener('DOMContentLoaded', function() { fetchBooks() })
get data from fetch response html
fetch('/about').then(function (response) { // The API call was successful! return response.text(); }).then(function (html) { // Convert the HTML string into a document object var parser = new DOMParser(); var doc = parser.parseFromString(html, 'text/html'); // Get the image file var img = doc.querySelector('img'); console.log(img); }).catch(function (err) { // There was an error console.warn('Something went wrong.', err); });
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